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Product Warranties - Product Warranty Activities (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Guarantees [Abstract]    
Beginning balance $ 8,261 $ 5,205
Product warranty liability from Newport Merger   3,040
Provisions for product warranties 15,884 8,858
Direct and other charges to warranty liability (14,041) (8,842)
Ending balance $ 10,104 $ 8,261